Baobab can be started from the greeter
Hello,
When booting up, if you have a disk that is almost full, a popup telling you so will be displayed on the GDM greeter.
That popup contains a button ignore but also an other button that will start baobab as the GDM user.
I'm not sure if it's a good idea to do so as baobab seems to recursively walk-through the partition and that could cause performance degradation (DOS?) if the partition is really big and/or over the network